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NSD > Schools > John Otis > Classes & Staff > Robello > Math Unit 7 Sec 1 Review Pt 2 |
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Unit 7 Section 1 Divisibility Rules |
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Divisibility Rules If the last digit of a number is zero, then the entire number is divisible by 2, 5 or 10
If the last number is even (2,4,6,8) then the entire number is divisible by 2
If you add the digits in a number and the sum (Ex: 45 = 4+5=9; therefore 9/3=3) is divisible by 3
If the last digit of a number is five, then the entire number is divisible by 5
PRIME NUMBERS
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101 |
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